Quote:
Originally Posted by Lzyslckr
I think I got it. I was having the search field look in the author field and search mode in match. I could have put the search on artist and search mode be expression and it writes to the author field. 
So it looks like
search field: #artist
search mode: regular expression
search for: (.+)
replace with : &\1 ( append mode selected )
destination field: #authors <is this a custom field that has a similar name? otherwise, lose the #
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Marked up your original, but not tested